Milling machine for musical-instrument knobs



April 27 192 1,582,870

E. J. GULICK MILLING MACHINE FOR MUSICAL INSTRUMENT-KNOBS Filed Oct. 1922 3 Sheets$heet 1 .Fiyi.

, I inventor g,

April 27,1926.

E. J. GULICK MILLING MACHINE FOR MUSICAL INSTRUMENT KNOBS 3 Sheets-$heet 2 Filed Oct. 30 1-922 IIzI/en 1:01

jttoj'ney I April 27 1926. 1,582,870

E. J. GULICK MILLING MACHINE FOR MUSICAL INSTRUMENT KNOBS Filed Oct. so] 1922 s sheets-sheet 5 I 5|IIIIIIIIFIIIMIIIIIIIIIIIIIKI Fly-16' VVi'tness if I C.7Z;vJ/ I a 2/ Attorney UNITE EDWARD J.

"stares PATENT QFFICE;

GULICK, OF ELKHART,- INDIANA, ASSIGNOR TO C. G. CONN, LTD., OF

ELKI-IART, INDIANA A GORPORATEON OF INDIANA.

MILLING MACHINE FOR MUSICAL-INSTRUMENT KNOBS.

Application filed new so, 1922. Serial No. 597,731.

T 0 all whom it may concern:

Be it known that I, EDWARD J. GULICK, a citizen of the United States residing in the city of Elkhart, county of Elkhart, Indiana, have invented certain new and useful Improvements in Milling Machines for Musical-lnstrument Knobs, of which the following is a specification.

This invention relates to improvements in the manufacture of musical instruments, and particularly to the manufacture of saxophones.

In brass instruments, and particularly saxophones. modulations of the tone produced are effected by the control of valves which establisl'i or close communication between the interior of the instrument hotly and the air. These valves are plates provided on their operative. surface with a cusnioning element and their application to or removal from the valve seat is effected by lifting the plates through a lever arrangement which the player actuates with his fingers. levers are formed by knobs and the present invention is directed to improvements in a machine by means of which the heads of the knobs serving as supports forthe fulcrum pins may be suitably machined to ZICCOIDEUOClfitQ the pins and the levers for the valve plates.

it is therefore an object of the invention to provide a machine in which through suitable adjustment of the instrument body with respect to oneor a plurality of tools the operative relation between the knobs and the tools may be established, whereby upon driving said tools the knobs are machined. I

It is also an objectof the invention to arrange a plurality of rotary cutting tools. as for instance ordinary milling-cutters, on a single shaft, in spaced relation corresponding to the spaced relation which knobs loca ed inthe same axial plane of the saxophone body occupy. a V

The invention also has the object of combining a plurality of carriers of milling cutters or the like in a single support and to provide for the adjustability of this support so to selectively place any one'of The fulcrums for the valve these. carriers into operative relation with the drive of the machine.

Another object of the invention is to provide for the adjustment of theinstrument body in such manner that the body may be rotated about its axis and may be secured in the adjusted position to bring a lumber an axial series of knobs into operative relation with res sect to the cutters or with respect to that assembly of cutters which, through selective adjustment of the common support of the cutter carriers, has been placed in a predetermined position;

'lheinvention also contemplates to proide a machine in which normally the in tion of the n'iillingcutters is avoided.

The invention also hasthe object of providing in a machine of 'this character means for positively locking the common support of the carriers of the milling cutters in one of several pre'deteri'ninedpositions to prevent inenact adjustment of the carrying shaft for an assembly of cutters.

The invention also has the object of including in a machine of this character means for positively locking the instrument body in any one of a plurality of positions after rotary adjustment to assure that the knob or knobs to be machined are exactly in that position in which the operation can be per-' formed with the highest degree of eiiiciency and speed.

The invention also has the object of providing a single drive shaft for a plurality of" carrying shafts for the milling cutters and to effect the operative connection of the single drive shaft'with the selected shaft of the milling cutters only when the source of power is placed in operative relation with respect to the machine, whereby automatically this driving relation between the drive shaft and the selected cutter shaft is interrupted upon interruption of the drive to prevent accidental displacement of the selected cutter shaft from operativeposition.

The invention also has the object of providing a support for the saxophone body which is movable to such an extent that the insertion of a saxophone body on a mandrel or the removal of the body from the mandrel may rapidly be effected without interfering with the rapidity with which a second bearing for the saxophone body may be placed to operative position to retain the body during operation.

With these and numerous other objec' s in view, an embodiment of the machine is illustrated in the accompanying drawings, the novel features being pointed out in the appended claims, and is described in the following specification.

In the drawings:

Fig. 1 is a front eleva ion of the machine with parts shown broken away; v

F ig. 2 is a top plan view on the operative elements of the machine;

Fig. 3 is an end elevation of the machine;

Fig. 4 is a sectional view on the line 4.4

of Fig. l on a somewhat larger scale, showingthe support of a carrier for the cutter shafts;

Fig. 5 is a horizontal section on line 55, Fig. 1, through the drive and clutch for the cutter shafts;

Fig. 6 is a detail view, partly in section of the actuating elements for the clutch;

Fig. 7 is a sectional view on a larger scale on line 'Z7, Fig. 1, through the end of the mandrel supporting shaft;

Fig. 8 is another sectional view on line 8 8 of Fig. 1.;

Fig. 9 is a side elevation of a cutter;

Fig. 10 shows a clutch head in elevation;

Fig. 11 is a front view of the same;

Fig. 12 is a front view of the companion clutch collar;

3 is an edge view of the same;

Figs. 1%, 15 and 16 are elevations of different knobs;

Fig. 1'? shows partly in section and partly in elevation a clamp bearing for the mandrel, and

Fig. 18 is a sectional view and part elevation of the device for fixing the saxophone body on the mandrel.

Fig. 19 is detail view of the end of one of the tool spindles.

The machine comprises standards 1 on which a bed 2, similar to the bed of a lathe, is supported. The bed carries on its top surface a head bearing 3 and a tail bearing l; the latter may be longitudinally adjustable thereon, the bed having a T-groove 2 to receive the heads of clamping bolts l inserted through the base of the bearing (Fig. 8). This renders possible the use of cutter shafts of variable length. The bearings 3 and 4 serve for rotatably carrying the supports of thecutter shafts.

The head bearing 3 consists of a split and approximately cylindrical casing 5 in which is rotatably fitted a drum support 6 for jack shafts or extensions of the cutter shafts Figs. 1, In the illustrated embodiment three of these extensions 7 are shown, each being mounted in a journal sleeve 8 which is located in a bearing 9 of the drum 6. The tubular bearings are connccted with a central sleeve 10 and the latter is keyed to a rotatable bar 12 which extends therethrough. For retaining the drum 6 and thereby also the extensions 7 in selectively pr determined position relatively to the bed, a locking device is provided com; prising a spring cont-rolled plunger 11, Fig. l, which is slidable in a tubular extension secured to the casing 5. The upper end of this plunger carries a knob 15 having a cam surface 16 which cooperates with a companion cam surface 13 on the sleeve 14-, whereby upon rotation of the knob 15 in one direction the plunger will be withdrawn against the tension of the spring while upon rotation of the knob in opposite direction the spring will force the plunger 11 with its reduced end 18 into one of the three sockets 19, which are provided on the circumference of the drum The tail bearing 1 also rotatably supports the bar 12, on which is fixed a spider 20 carrying removably the ends of the tool spindles 21.

The. mechanism for individually and selectively driving these spindles comprises a motor 22 on a bracket 23 and having a pulley from which a driving belt 24 extends to a pulley :25. The pulley is connected by means of the bolts 26 and web 27 (Fig. 5) with the flange 28 of a bushing 29 secured to a countershaft 30 by a key. The bushing and countershaft are. supported in the bean ing 31 forming part of a-bracket 32 which. is secured to the bed of the machine. This hearing has a flange 33 in marginal abutment with a cylindrical extension 6 of the drum 6, to form a housing for the QXLGHSlODS 7. In this way the drum 6 with the bearing for the central bar 12 therein may be rotated while maintaining permanently closed the chamber in which these parts are located. The rotation of the drum 6 is effected by means of one or more handles 36 which project from this drum extension 6.

The countershaft 30 ends in a coupling head 3% provided with a plurality of claws and the shaft extensions 7 also are provided at their ends with collars adapted for operative engagement with the head 34 of the countershaft.

The tool shafts 21 which carry the cutters 37 are readily attachable to and removable from the shaft extensions 7, from which they are driven, as they are provided with flattened end portions 21 adapted to enter the recesse in the shaft extensions 7. Their projecting ends have screw threads at whereby the nuts 40, Figs. 1 and 2, may be secured'partly on the interengaging ends of the extensions '4" and tool shafts 21 to prevent axial displacement of these parts.

Brackets ll which are secured at the front end of the bed by means of clamping bolts 42 entering a longitudinal l -groove carry each a bearing for a rock shaft (l4. l is rock shaft is provided with longitudinally adjustable clamping collars 4C5, 46, on whi h the bearings for the mandrel are supported, so as to be rotatable in the plane of the top surface of said collars.

The head bearing 47 for the mandrel 50 comprises a cylindrical casing with a horizontal axis and having in lL-S lower part a socket l8 with a vertical axis. A cylindrical extension 49 provided with a groove 51 projects from the collar l5 into the cylindrical bore 48. A short key '52 seated in the groove 51 of the extension as traverses a portion of the bearing 47. This permits of rotary movement of the bearing e7 with respect to the pedestal or collar 45, prevents however displacemen in upward or downward direction.

The mandrel 50 is secured to the stem 50 which is supported in the bearing 47 and which is provided within the bearing on its circumference with several sockets 53 to re ceive the locking pin 5% at the end ofa spring controlled plunger 55, guided in a tubular extension 56 of the bearing 47; The sleeve terminates in a cam surface 57 in cooperation with a companion surface 57 on a knob 58 fixedly connected with the. plunger, Fig. 7. Upon part rotation of the knob in one direction the plunger will be witl'idrawn by the cam action against the tension of the spring while upon rotation in the other direction the spring will causethe locking pin to enter into one of the sockets on the stem 50. provided the latter has been turned to bring a socket into alinement with the plunger. The location of the sockets on the mandrel stems circumferentially corresponds with the circumferential di tribntion of the knobs K or of axial series of knobs on tire saxophone body S.

The mandrel 50 is a conical partly tubular element having at the smaller end an axial exten ion pin 59. This pin is supported in a clamp bearing 60 mounted on the collar 46. The bearing 60, which is partly split longitudinally carries a journal bar 61 having one end a socket to receive the reduced pin 59 of the mandrel. The two split parts are provided withalined bosses mandrel or to provide a seat for this. pin.

The base plate of the bearing 60 is provided with two arcuate slots 63 through which P11 clamping screw extend into the collar whereby the tail bearing of the mandrel may be an ularly adjusted and locked in proper position.

A. lever 6 is attached to the rock shaft 4% by means of a collar and serves as a handle whereby this shaft may be turned about its axis. Another collar 65 adjacent the iirst named collar has a downwardly extending arin Fig. 8) 66 through the ends of which an adjustable stop screw 67 extends. This stop will contact with the bracket 68 on the bed of the machine when the shaft la is rocked downward through a certain arc. rocking movement of the shaft in the opposite direction, a stop screw 69 projects adjustably through the bracket 68, the point of the screw contacting with a boss on the arm 66 when the lever G-l and shaft l i are swung in the opposite direction.

As both of the bearings 47 and 60 are independently adjustable about vertical axes their distance also being adjustable through displacement of the clamp collars e5 it is obvious that the mandrel may be adjusted to have its axis at an angle to the axis of the bar 12. In this manner the engagement 2 all of the tools 37 on a selected spindle with all of the heads of the knobs K ot a series is assured in that manner which is required for properly milling g thesame. It is also obvious that regardlcgs of the length of thebed of the machine, mandrels of diii erent length and of different taper may be mounted on the machine and that simultaneous engagement of the tools with those knobs K may be effected which are axially alined on the surface of the saxophone body S. The rocking movement of th shaft is effected by the le *er (3% regulates the depth to which the cutters engage the heads of the knobs. From Fig. 8 it is apparent that, owing to the inounti described, the axis of the mandrel when-L. operative position is not parallel to the axes of the bar 12 or spindles 21, but that that surface line of the saxophone body which carries the knobs to be Worked is parallel to said axes.v I

For adjustably limiting the operative or "Until n :r

The belt 2%- is normally t such l ngth as to slip over the rim of the pulley 5 without causing the drive of the same. in order to bring the belt into operative relation, a tightener pulley is mounted on an arm '51 secured to a lever 72 which is pivota ly supported in a bracket '73 at the end of the machine. A spring 'Zei anchored its up per end in the bed, as shown in Fig. 1, tends to pull the lever 72 upwardly to retain thereby the idler pulley in inoperative position. In order to move this pulley to operative position a link 75 pivoted to the lever 72 extends to another arm 76 which is edly secured on a rock shaft T7 supported near the bottom of the bed and provided with a treadle arm 78 which projects for-- wardly within convenient reach of t 1e operator to be manually engageable by l.llll. Upon depression of the treadle the ro k shaft will GilCCt a swinging movemen l' the lever 72 to force the idler 70 towards the belt and to tighten the same. Upon release of the treadle the spring Tel will pull the rock shalt into normal position owing to the connection of tie spring with the arm 72, and owing to the connection of this arm with the rock shaft 77.

The sar e treadle shalt also serves for 'ilacing the drive shaft 30 into operative lost-ion, and it may also serve :torapplying a brake to the pulley or, respectively, tor

withrawing the brake. link 80 which is flexibly connected to the treadle shaft 7? by means of arm 81 extends upwardly and is, through arm 82, in connection with a collar 83 which is loosely mounted on a rod 55 i, slidably secured in the bed oi the machine. lhis rod extends at one end through a bushing 85, F 6, secured to a vertical web of the bed. The collar 83 to which the link 80 is connected is provided with a cam surface 86 in cooperation with a companion surface 86 on a collar 87 fixed to the rod S-l.

It, therefore, the treadle arm 78 is depressed, the link 80 will be forced upward, causing a displacement of the rod to the left shown in Fig. l. The outer projecting portion of the rod i pivotally connected with the lower end of a lever 88 which fulcrumed at 89 on a bar 90 projecting from the bracket The upper end oi this lever is bifurcated and is provided with pins 9t extending into an annular groove of a split collar 92 (Fig. 5), which is rotatably connected with the drive shaft 30 but which is held against axial displacement on the said shaft. Upon displacement of the rod Slto the left, as described, the lever 88 will be moved inward at its upper end, thereby forcing the collar and the shaft 30 inward and bringing the coupling element 3% into operative position relatively to that extension 7 which had been placed into operativ position by the previous rotation of the drum 6. When the treadle arm 78 is released the treadlo shalt T? will again be restored to its original position by the spring l i, thereby also causing the return or the lever 88 to a position in which shaft 30 is withdrawn from coupling position.

A lateral projection 93 on the lever 88 is adapted to engage a brake shoe 9% indicated in dotted lines in 1 and normally engageable with the rim of the pulley The various knobs l3; n the tubular taper-- ing bodies of brass instruments or the like, and part cularly the knobs of saxophones, are distributed on the outer surface in such manner that some of these knobs, although spaced irreg ly from each other, are in axial alinement, in which case a plane may be defined by the common axis of these knobs and by the axis of the saxophone body.

The body S is placed on the mandrel and secured against di placement by a knob 100, havi a reduced portion 101 threaded at- 102 to cooperate at the threaded p rtion with a screw 103 in the stem 50 of the mandrel, said knob reduced portion, which engages in a suitable recess in the stem 50, serves also to retain the mandrel 5O securely on said stem, Fig. 18. The mandrel 50 for supporting the saxophone body S is then secured in place, and is held in one of several rotatably selective positions by means of the locking pin Six of these selective locking positions are indicated in Fig. 7, although it is obvious that the number ct th positions may vary with dilierent types of instruments. The opposite end of the mandrel is secured by means of the reduced extension in the slide clamp bearing shown in Fig. 17. This slide clamp bearing and the bearing at the larger end of the mandrel are then adjusted in such manner that upon rotation of the shaft 44-, on which the bearing brackets a5, 4.6 are clamped, the mandrel will be moved relatively to axes of the cut ter shafts in such manner that the mandrel line of the saxaphone body containing the with the arrangement of the knobs to be finished by the same. it may be advisable to leave the cutters on their shafts in these positions after they have once been placed thereon and to utilize different shafts for different types or instruments or for the same type of instrument but for different l hese three units of cutters and cutter shafts are inserted into their supports 6 and 20. the left hand ends of the cutter bearing shaft-s 21 are operatively united with the corresponding shaft extensions 7 through nuts 40. The operator then rotates by means of the handles 36 (Fig. 1) the support 6 into that position in which the selected shaft 21 and cutters 3'? are in operative relat-ionto the body. In this position that shaft extension 7 which is associated with theselected shaft 21 is in opposition to the drive shaft 30. After this adjustment of the cuttershafts 21 through rotation of the drum 6 has been efiected, this drum is locked by th locking pin 13, Fig. 4.

The lever 64 for controlling the supporting shaft 44 of the bearing brackets for the mandrels is still projecting downward; the

mandrel 50 and the bearings 47 6O supporting the mandrel are at such distance from the cutting edges of the tools 37 that the knobs I: are below a horizontal plane which contains the axis of the selected shaft, and also that of the supporting bar 12 for the plurality of shafts 21. The parts are in a position different from the position shown in Fig. 8, the stop screw 67 near the lower end of the arm 66 being then in engagement with the bracket 68.

After this adjustment of these parts the operator depresses the treadle arm 78 and thereby causes the tensioning of the belt 24,- whereby the pulley 25 and shaft 30 are driven by predetermined rate of speed. This depression of the treadle shaft also ac tuates the clutch lever 88 shifting the shaft 30 axially into a position in which its clutch head 34 enters into operative engagement with the corresponding coupling collar 35 of the selected shaft extension 7. Simultaneou'ely with the tightening of thebelt 24 and with the movement of the elutch lever 88 to throw the shaft 30 and coupling 34 to operative position, the brake shoe is re leased from the pulley and the pulley is therefore ready to assume its normal speed at great acceleration.

The operate: unis u e'lever 64 rotate the bearing supporting shaft 44 until the parts reach the position indicated in Fig. 8 and in which a further movement of the shaft 44 is arrested byjthe adjustable stop 69. This movement slightly lifts the bearings 47 60 for the mandrel and at the same time moves the bearings with the mandrel andxthe saxophone body secured thereto into the operative position, Fig. 8, in which one series of knobs may be milled as required by the cutters 37 properly arranged and spaced from each other on the selected cutter shaft 20. As the milling operation requires relatively short time, the operator may arbitrarily apply greater or less force to the lever for maintaing the horizontal rock shaft 44 in operative position, or, if the material to be treated should prove exceedingly hard, the operator may intermittently lower the lever to prevent overheating of the parts and then again raise the parts to operative position until the operation is complete-d.

In order to mill the knobs in another series, the operator loosens the slide clamp bearing60 and rotates the mandrel after withdrawal of the locking pin 54, inserting this locking pin again after another one of the siX series of knobs shown in Fig. 8 has been moved into such position that upon retur ing of the parts to operative relation, Fig. 8, this other. series will be located in a horizontal plane containing the axis of the selected cutter shaft and the axis of the common support. As the knobs in this second series may be staggered longitudinally in a man ner different from the knobs of the series previously treated, the operator will select now a shaft 21 having cutters 3? arranged to correspond to this second series of knobs. This is effected by releasing the locking pin 18 for the drum 6, Fig. 4, and then rotating said drum by means of the handles 86 until the selected second shaft 21 is in operative relation to the body 8. The looking pin 18 is then restored to locking position, and after the slide clamp bearing 60 has been readjusted to fixedly hold the mandrel 50 at the reduced end, the operator again depresses the treadle arm T8 and then swings the lever 64 upward to bring this second series of knobs into milling position. v v v In a similar way the operation may be repeated with respect to a third series of knobs. and the third assembly of bearing shafts and cutters. If then any one of the other series of knobs (six being illustrated in 8) should require a treatment by cutters which arespaced differently from those at the present in the machine, or by cutters of different diameters (as for instance, in order to treat one or more knobs K of the double valve: system shown in Fig. 154) the retr eval of the previously llii used cutter shafts 20 may readily be effected by loosening the nuts and withdrawing the respective cutter shafts 21 from the machine, replacing them by other shafts which have cutters in proper arrangement and of proper diameter.

I claim:

1. In a machine of the character described, the combination of a support for an instrument body, a plurality of tool shafts, a common support for said shafts at one end thereof, a second support for said shafts at the other end of the same, a central bar connecting both of said common supports, and means for selectively adjusting one of said supports.

2.111 a machine of the character described, the combination of a support for an instrument body, a plurality of tool shafts, a common support for said tool shafts, shaft extensions mounted in said common support, and means for operatively and exchangeably connecting tool shafts with the shaft extensions of said common support.

3.111 a machine of the character described, the combination of an instrument body, a plurality of tool shafts, a common support for said tool shafts, shaft extensions rotatably. mounted in said common support, and means for exchangcably maintaining the tool shaf s in alinement with said shaft extensions.

In a machine of the character de- F scribed, the combination of a support for an instrument body, a plurality of tool shafts, a rotary drum, shaft extensions individually supported within said drum,

said shaft extensions being; provided with ends projecting from the drum and means for detachably uniting the ends of said extensions with the ends of the tool shafts and for retaining the shafts in alinement with said extensions.

In a machine of the character described, the combination of a support for an instrument body, a plurality of tool shafts, a. drum rotatably mounted in the machine, a plurality of bearings circumferentially spaced in the interior of the drum, shaft extensions rotatably supported in said bearings and projecting from the drum, means for uniting the tool shafts with the projecting ends of the shaft extensions and in alinement thereto, a second common support for said tool shafts, a central bar extending through said drum and through said second support, and a cylindrical casing forming a bearing for said drum.

6. In a machine of the character described, the con'ibination of a support for an instru mentbody, a tool shaft, and means for adjusting the position of said support relatively to said tool shaft axially of said shaft and in a horizontal and vertical plane.

7 In a machine of the character described, the combination of a support for a tapering instrument body having a plurality of parts in alinement Within an axial plane of said body and distributed on the circumference of the body, a tool shaft parallel to the axis of said body, and means for adjusting said support and body with respect to the tool shaft to bring the line on which said parts project from the body into parallelism with the axis of the tool shaft.

8. In a machine of the character described, the combination of a support for an instrument body, a tool shaft, a bearing for said support, means for locking said support within said bearing against circumferential displacement, and means for selectively adjusting said bearing in a horizontal plane and in a vertical plane with respect to said tool shaft. i

9. In a machine of the character described, the combination of a support for an instrument body, a tool shaft, bearings at the two ends of the support, a common carrier for said bearings on which the bearings are axiallly adjustable, said bearings being adjustable independently of each other on their carrier in a horizontal plane and being adjustable independently ofeach other in a vertical plane relatively to the shaft.

10. In a machine of the cl aracte-r described, the combination of a support for an instrument body, a tool shaft, a bearing for said support, means for locking the support against rotation Within said bearing in selected predetermined position, a carrier for the bearing, and a. bracket inserted between the carrier and the bearing, the bracket being longitudinally adjustable on the carrier and the bearing being rotatably adjustable on the bracket relatively to the shaft.

11. In a machine of the character described, the combination of a suport for an instrument body, a bearing for said support, means for selectively locking said support Within the bearing in a rotatable adjusting position,'a carrier for the bearing, a bracket mounted on said carrier and supporting the bearing, said bearing being adjustable about an axis on said bracket, said bracket being axially adjustable on the carrier and the carrier being tiltable about its own axis.

12. In amachine of the character described, the combination of a support for an instrument body, a rock shaft, clamps adjustably mounted on said rock shaft, bearings for the instrument body rotatably secured to said clamps, and means for imparting a rocking movement to said shaft.

13. In a machine of the character described, the combination of a support for an instrument body, a rock shaft, a bearing for said instrument body associated with the rock shaft, and means for preventing ver tica-l displacement of said heating relatively to said rock shaft withoutpreventing rotary adjustment of said bearing in a'predetermined plane.

14. In a machine of the character described, the combination of a bearing for an instrument body, a rock shaft, a bracket axially adjustable on said rock shaft and having a cylindrical extension, said bearing having a cylindrical bore rotatably fitted to said extension, and means coacting with said here and extension for preventing displacement of said bearing in dire tion to the of said extension, said bearing being rotat able on said extension.

15. In a machine of the character de scribed, the combination of rotary tools, a support for an instrument body, a rock shaft, bearings for said support, brackets secured to said rock shaft and supporting said bearings, means for moving the rock shaft relative to the tools, and means for limiting the movement of said rock shaft in either direction.

16. In a machine for milling the knobs of a wind musical instrument, the combination of a tapered mandrel for the instrument body, said mandrel being movably supported in the machine, rotary tools in axial alinenent with each other, means acting on said mandrel for bringing the instrument body into and out of operative relation with respect to said tools, and means for adjustably limiting the movement of said mandrel with respect to said tools.

17. In a machine for milling the knobs of a wind musical instrument, the combination of a tapered mandrel for the instrument body, said mandrel being movably supported in the machine, a plurality of tool shafts, a prime mover for the machine, means for selectively bringing any one of said tool shafts into operative relation with respect to said prime mover and said mandrel.

18. In a machine for milling the knobs of a wind musical instrument, the combination of a tapered mandrel, a hollow instrument body carried by the mandrel, a plurality of tool shafts, means for selectively moving any one of said shafts to operative relation with respect to the instrument body, a drive shaft, means for normally disconnecting said drive shaft from said tool shafts, and means for establishing a connectionbetween said drive shaft and a selectively predetermined tool shaft.

19. In a machine for milling the knobs of wind musical instrument, the combination of a tapered mandrel, a hollow instrumentbody mounted upon the mandrel, a plurality of tool shafts, means for moving any of said tool shafts into operative relation with respect to the instrument body, a prime mover, a drive shaft, a transmission between said prime mover and drive shaft, said transmission being normally inoperative, and means shaft placed into operative relation.

20. In a machine for milling the knobs of a wine musical instrument, the combination of a tapered mandrel to support the instrument body, a plurality of tool shafts arranged in a circular series about a common axis, 1 leans forfselectively bringing any of said shafts into operative relation with respect to said body, a prime mover, a drive shaft, coupling members on said tool shafts, means for normally maintaining said coupling members out of operative relation, and means for simultaneously effecting actuation of said drive shafts from the prime mover and for bringing predetermined coupling members into operative relation.

21. In a machine for milling the knobs of a wind musical instrument, the combination f a tapered mandrel to support the instru ment body, a plurality of tool shafts each terminating in a coupling member, a drive shaft having a coupling member, means for selectively moving any of said tool shafts to operative relation with respect to the instrument body, driving means for the drive shaft normally inoperative, andv means for rendering said last named means operative and for establishing connection between the coupling member of the drive shaft and the coupling member of a selectively predetermined tool shaft.

in a machine of the character described, the combination of a mandrel for an instrument body, said mandrel being movably supported in the machine, a plurality of tool shafts, means for selectively moving any one of said tool shafts to operative position, a drive shaft, a pulley driven thereby, a prime mover, a belt transmission nor mally inoperative between said pulley and prime mover, and means for simultaneously rendering said belt transmission operative and moving said drive shaft into operative relation with a selectively predetermined tool shaft.

23. In a machine of the character described, the combination of a plurality of tool shafts, means for selectively placing any one of said tool shafts in operative connection with respect to an instrument body, a drive shaft, a motor, a belt transmission extending from said motor to said drive shaft and normally slack to prevent transmission of power, and means for simultaneously tensioning the belt and axially displacing the drive shaft in operative relation with respectto a selectively predetermined tool shaft.

2%. In a machine of the character described, the combination of a support for an Ind fixedly connected with said drive shaft, a motor, a transmission belt between said puley and motor, a tensioning device for the belt, a treadle shaft, connecting elements extending from said treadle shaft to said drive shaft, connecting elements between said treadle shaft and the tensioning device, and

means for simultaneously operating the two sets of connections to force the drive shaft into operative relation and to tension tho belt. V

In Witness whereof I have hereunto affixed my signature 27th day of October, 1922.

EDWARD J. GULICK. 

